描述
1、電流互感器二次開路或接觸不良有何征狀?
(1)電流表指示不平衡,有一相(開路相)為零或較小
(2)電流互感器有嗡嗡的響聲
(3)功率表指示不正確,電度表轉(zhuǎn)動減慢
(4)電流互感器發(fā)熱
2、停用電壓互感器應(yīng)注意什么?
(1)應(yīng)首先考慮因該電壓互感器停用而引起有關(guān)保護(hù)(如距離保護(hù))及自動裝置(如備投)誤動,必須先申請停用有關(guān)保護(hù)及自動裝置。
(2)停用電壓互感器包括高壓側(cè)刀閘,次級空氣開關(guān)或熔絲,防止二次側(cè)反充電。
3、切換電壓互感器時(shí)怎樣操作低周減載裝置的電源?
切換電壓互感器時(shí)應(yīng)保證不斷開低周減載裝置的電源。一般兩臺電壓互感器均可并列運(yùn)行,因而在切換電壓互感器時(shí),先用低壓并列開關(guān)將兩臺電壓互感器并列后,再斷開停用的電壓互感器,保證低周減載裝置不失去電源。當(dāng)電壓互感器不能并列時(shí),切換電壓互感器前,應(yīng)先停用低周減載裝置的直流電源。
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